Lasioglossum (Dialictus) pictum (Crawford)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 157

Lasioglossum (Dialictus) pictum (Crawford)

Halictus pictus Crawford, 1902a: 236 . Ƥ.

Syntypes. 2Ƥ USA, Nebraska, Crawford, Sioux Co., 29.vii.1901 on Mentzelia, (M.A. Carriker) ; [UNSM]. Examined. Halictus graenicheri Ellis, 1914b: 221 . Ƥ.

Holotype. 1Ƥ USA, Wisconsin, Genoa, Vernon Co., Wisconsin, 13–19.vii.1911 [ NMNH: 27761]. Examined. Dialictus muskegonensis Mitchell, 1960: 439 . 3.

Holotype. 3 USA, Michigan, Muskegon Co., 2.viii.1944, (R.R. Dreisbach); [ NCSU]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) graenicheri , p. 1113, L. (C.) pictum , p. 1116 (catalogue); Krombein, 1958: Lasioglossum (Chloralictus) graenicheri , p. 230, (catalogue); Mitchell, 1960: Dialictus pictus Ƥ, p. 412 (redescription, synonymy); Mitchell, 1962: Dialictus pictus , p. 547 (synonymy); Krombein, 1967: Lasioglossum (Dialictus) pictum , p. 465 (catalogue); Hurd, 1979: Dialictus pictus , p. 1970 (catalogue); Moure & Hurd, 1987: Dialictus pictus , p. 122 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) pictum Ƥ3, p. 249 (redescription, key).

Diagnosis. Female L. pictum can be recognised by the following diagnostic combination clypeus black-brown distally; postgena polished; lower paraocular area with moderately sparse tomentum; mesoscutum not obscured by tomentum; mesepisternum reticulate-punctate; legs mostly brown; and metasoma orange-yellow metasoma, apical impressed areas obscurely punctate. They are most similar to L. arantium , which has a reddish orange metasoma and a completely lineolate postgena.

Male L. pictum can be recognised by head moderately elongate (length/width ratio = 0.98–1.02); face with moderately dense tomentum; flagellomeres short, orange-yellow ventrally; mesoscutal punctures moderately sparse (i=1–2d); parapsidal line narrow; mesepisternum distinctly punctate; and metasomal terga reddish brown, apical margins orangeyellow. They are similar to L. foveolatum , which has a very deep and wide parapsidal lines ( Fig. 15 B) and brown metasomal terga.

Range. Ontario west to Alberta and Nebraska. USA: IN, MI, MN, NE, WI. CANADA: AB, MB, ON, SK.

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon east of the Mississippi.

Figures

FIGURE 15. Parapsidal line of mesoscutum, indicated by arrow, (A) narrow, (B) wide (L. foveolatum). (From Gibbs 2010 b).